CN2195147Y

CN2195147Y - Electronic current overload protection relay for vehicle

Info

Publication number: CN2195147Y
Application number: CN 94237865
Authority: CN
Inventors: 刘小平
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-07-26
Filing date: 1994-07-26
Publication date: 1995-04-19
Anticipated expiration: 2004-07-26

Abstract

The utility model relates to an electronic current overload protection relay for vehicles. The utility model is composed of a relay running and controlling circuit 1, an electronic switch 2, an overload protection circuit 3 and a current detection circuit. When the utility model is used, the utility model is matched with the storage battery and the electrical load of the vehicle. The utility model is characterized in that the functions of the fuse and the relay are combined into a whole, the electrical load is supplied with electrical power under the normal condition, when the circuit or the load has a short circuit or an over current, the circuit can be switched off in time and protected, the action of the utility model is flexible and reliable, the action time is less than or equal to 0.5 ms, when generated, the fault can be displayed, when the fault is eliminated, the electrical power supply can be recovered in time, the trouble of maintenance is eliminated, and the normal running of th vehicle is guaranteed.

Description

Electronic current overload protection relay for vehicle

The utility model relates to a kind of emergency protective circuit device, the automobile-used overcurrent protection relay of particularly a kind of electronic type.

Vehicular electrical appliance is because often be operated in the big adverse circumstances of high temperature, greasy dirt, muddy water, vibration frequency height, amplitude; so circuit bonding and current overload fault happen occasionally; and the protection of existing vehicular electrical appliance control device during to current overload all is to realize by fuse or metal protector.The shortcoming of this overload protection is, because the fusing of fuse is all wanted the regular hour, therefore under its situation about not fusing as yet, big electric current may cause the damage to circuit or electric elements; Fuse needs artificial replacing the, the operation that this just brings the trouble of maintenance and influences vehicle in case fusing just can not recover voluntarily besides.In addition, as using more relay for automobile in the vehicular electrical appliance, it only possesses controlled function and does not possess defencive function, if can then be the thing of killing two birds with one stone with its functions expanding to being used for overcurrent protection.

For above-mentioned consideration, the purpose of this utility model, be provide a kind of can be under the current overload failure condition in time open-circuit line grant asylum and at the automobile-used overcurrent protection relay of the electronic type that can restore electricity voluntarily afterwards.

Below in conjunction with drawings and Examples the utility model is described in detail.

Fig. 1 is an electric functional-block diagram of the present utility model;

Fig. 2 is the schematic diagram of a kind of physical circuit of Fig. 1 block diagram.

Referring to Fig. 1, solution of the present utility model is as follows.It is by containing relay J ₁Relay fortune control circuit 1; electronic switch 2; overload protecting circuit 3 and current detection circuit 4 are formed; a power input of switch terminals of electronic switch 2 and relay fortune control circuit 1 is connected in the E point; one power input of another switch terminals and overload protecting circuit 3 and a power input of current detection circuit 4 are connected to the G point; another power input of relay fortune control circuit 1 and another power input of overload protecting circuit 3 are connected in the F point; the input of overload protecting circuit 3 and output join with the output of current detection circuit 4 and the control end of electronic switch 2 respectively, the relay J of relay fortune control circuit 1 ₁Normally opened contact J _1-1An end link to each other with another power input of current detection circuit 4.

The utility model with foregoing circuit structure is when installing and using, and the voltage Vc with car battery joins with the G among Fig. 1, F end, with vehicle electric loading RL and normally opened contact J _1-1The other end link to each other.Under normal circumstances, the control signal that overload protecting circuit 3 is defeated by contactor 2 can make electronic switch 2 conductings, and relay fortune control circuit 1 gets electric work, contained relay J ₁Adhesive, its normally opened contact J _1-1Closure, vehicle gets electric work with electric loading RL.In case contact J _1-1The current overload phenomenon takes place because of short circuit or overcurrent in institute the load RL that connects or circuit; then big electric current is by current detection circuit 4; its output gives overload protecting circuit 3 inputs detection signal; make overload protecting circuit 3 produce the control end that control signal is given electronic switch 2; electronic switch 2 is turn-offed, make relay J ₁Discharge its normally opened contact J _1-1Disconnect, avoided big electric current harm so load RL or circuit protect.

Referring to Fig. 2, in this embodiment, relay fortune control circuit 1 also includes and relay J ₁The diode D that is in parallel of line bag ₂, electronic switch 2 is made of triode T, and overload protecting circuit 3 is by controllable silicon SCR, LED and resistance R ₁With R ₂Form, current detection circuit 4 is made of tongue tube GH.J ₁Line bag two ends join R with the emitter of triode T and the positive pole of LED respectively ₁Two ends are connected on respectively between the base stage and collector electrode of T, and the anode of controllable silicon SCR links to each other with the base stage of T, an end in the line river 1 of tongue tube GH and normally opened contact J _1-1Join, the normally opened contact two ends of GH respectively with collector electrode and the resistance R of T ₂Link to each other.In order to prevent that electric power polarity from connecing instead and being convenient to the Push And Release control of power supply, can add the diode D that is in series in Fig. 2 circuit ₁And K switch, D ₁Negative pole and the collector electrode of triode T join, the other end of K links to each other with the coil L of tongue tube GH.In order to strengthen the stability of power supply Vc, also can in Fig. 2 circuit, add filter capacitor C, the capacitor C two ends join with the collector electrode of triode T and the positive pole of LED respectively.

The concrete operation principle of Fig. 2 is as follows.During operate as normal, the K that closes a switch, Vc is through K, D ₁, R ₁Add forward bias for the base stage of T, the T conducting, Vc is added on relay J ₁Line bag two ends, J ₁Get electric adhesive, its contact J _1-1Closure, so load RL gets electric work, when current overload took place, big electric current passed through the coil L of tongue tube GH, its closing of contact, Vc is through R ₂Give SCR in addition trigger voltage, make the SCR conducting, the luminous faulty indication of doing of LED, the anode potential of SCR reduces, and T ends, J ₁Dead electricity discharges, J _1-1Disconnect.By the time after fault disappeared, no big electric current passed through among the coil L of GH, its contact disconnects again, so SCR turn-offs T conducting, J ₁Adhesive, J _1-1Closure, the power supply that recovers to give RL.

The utility model is incorporated into one with the function of fuse and relay, and effect is more excellent.It is active in one's movements reliably, and disengagement failure is timely, and operate time is smaller or equal to 0.5ms; The demonstration of having broken down, fault can restore electricity again after disappearing voluntarily; Its wiring is easy, has the electric power polarity recognition function, is applicable to various vehicles.

Claims

1; the automobile-used overcurrent protection relay of a kind of electronic type; it is characterized in that; it is by the relay fortune control circuit (1) that contains relay J 1; electronic switch (2); overload protecting circuit (3) and current detection circuit (4) are formed; a power input of switch terminals of electronic switch (2) and relay fortune control circuit (1) is connected in the E point; one power input of one power input of another switch terminals and overload protecting circuit (3) and current detection circuit (4) is connected to the G point; another power input of relay fortune control circuit (1) and another power input of overload protecting circuit (3) are connected in the F point; the input of overload protecting circuit (3) and output join with the output of current detection circuit (4) and the control end of electronic switch (2) respectively, the relay J of relay fortune control circuit (1) ₁Normally opened contact J _1-1An end link to each other with another power input of current detection circuit 4.

2, automobile-used overcurrent protection relay as claimed in claim 1 is characterized in that, relay fortune control circuit (1) also includes and relay J ₁The diode D that is in parallel of line bag ₂, electronic switch (2) is made of triode T, and overload protecting circuit (3) is by controllable silicon SCR, LED and resistance R ₁With R ₂Form, current detection circuit (4) is made of tongue tube GH.

3, automobile-used overcurrent protection relay as claimed in claim 2 is characterized in that, adds diode in series D in circuit ₁With K switch and also add filter capacitor C, D ₁Negative pole and the collector electrode of triode T join, the other end of K links to each other with the coil L of tongue tube GH, the two ends of capacitor C join with the collector electrode of triode T and the positive pole of LED respectively.